Microsoft Dynamics AX (Archived)

Global cache in thread.

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Posted on by Community Member

Hello, I am using thread as example on tutorial_Thread.

Everything work fine, but I want to pass objects between thread.

I see that Thread.setParam get as input a container.

I want to pass an object (the 'element' property of current form).

I see that container cannot include in its list of parameters an object (i.e, I cannot pass ['str', myObject]),

so I want to use the global cache.

When I setting global cache parameter, and get it on the thread method, It is null (that not happens for non-thread methods).

How can I pass global cache variable, and get it in thread (such as on TutorialThread::runThread method).

The global cache code may look like :

     SysGlobalCache globalCache;
    ;
    super();
    globalCache = Appl.globalCache();
    globalCache.set("listviewsql", curuserid(), element);

and on thread function (such as TutorialThread::runthread):

     SysGlobalCache globalCache;
    object c;
    ;
    super();
    globalCache = Appl.globalCache();
    c = globalCache.get("listviewsql", curuserid(), element);
// c is null!!! Why?

Thanks :)

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Martin Dráb 237,972 Most Valuable Professional on at

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It sounds like a lot of effort to create a thread-unsafe program. Are you sure it's a good idea from the beginning? What are you trying to achieve?

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Community Member on at

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Just need to pass parameters from one to a thread class.

One is the query, and the other one is a listview object, that I fill.

The thread class may doing query - just for view, but if it take too long, so I need to stop it in the middle.

I cannot pass a listview object, but I can pass a form::element object.

When using a thread, I cannot see the ele

(There are some cases, I need to stop the query in middle).

Thanks :)

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Community Member on at

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If not thread - is there any other way stopping long time consuming method in middle?

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Martin Dráb 237,972 Most Valuable Professional on at

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If I needed such behavior, I would probably implement it in .NET, because it's already supported there. See Cancel Async Tasks after a Period of Time, for example. Whether it's applicable in your case depends on what you're doing, which is unknown to me.

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Community Member on at

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Just want to do: select (direct sql select) fill a listbox, and be able to stop it, whether it is a long query.

Thanks :)

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Brandon Wiese 17,788 on at

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You will not be able to change a UI element in an off-UI thread. You cannot interact with a form at all off-UI thread. The only way to achieve this is to use callbacks to the UI thread using Thread::executeInUIThread(..). I once did an off-thread process (sending a fax) that produced a progress bar and rendered errors in the infolog. All calls to the SysProgress and to the infolog had to be sent back to the UI thread to work.

As far as sending objects, anything that you can serialize (pack and unpack) works fine. Records, for example, can be packed using built-in methods in AX 2012.

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Brandon Wiese 17,788 on at

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I should have been more specific. You'll have to pack and unpack objects yourself, but that gets the job done.

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Community Member on at

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Solved.

I did Thread::executeInUIThread ... that's how I refer to non-thread from thread.

in the execute method I can refer to globalcache, or whatever.

Thanks :)

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